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Business Combinations, Goodwill by Segment (Details) - USD ($) $ in Millions | 9 Months Ended
--- | ---
Sep. 30, 2024 | Sep. 30, 2023
Goodwill [Roll Forward] |  |
Goodwill | $ 4,587.4 | $ 4,528.0
Goodwill Additions, net of adjustments | 43.8 | 18.7
Goodwill, Written off Related to Sale of Business Unit |  | (0.6)
Goodwill, Translation Adjustments | 36.0 | (4.3)
Goodwill | 4,667.2 | 4,541.8
Markets Advisory |  |
Goodwill [Roll Forward] |  |
Goodwill | 1,759.3 | 1,742.9
Goodwill Additions, net of adjustments | 0.0 | 0.0
Goodwill, Written off Related to Sale of Business Unit |  | (0.4)
Goodwill, Translation Adjustments | 14.5 | (1.7)
Goodwill | 1,773.8 | 1,740.8
Capital Markets |  |
Goodwill [Roll Forward] |  |
Goodwill | 1,986.4 | 1,949.2
Goodwill Additions, net of adjustments | 3.4 | 18.7
Goodwill, Written off Related to Sale of Business Unit |  | (0.2)
Goodwill, Translation Adjustments | 16.3 | (2.0)
Goodwill | 2,006.1 | 1,965.7
Work Dynamics |  |
Goodwill [Roll Forward] |  |
Goodwill | 537.7 | 532.6
Goodwill Additions, net of adjustments | 40.4 | 0.0
Goodwill, Written off Related to Sale of Business Unit |  | 0.0
Goodwill, Translation Adjustments | 4.4 | (0.5)
Goodwill | 582.5 | 532.1
JLL Technologies |  |
Goodwill [Roll Forward] |  |
Goodwill | 247.7 | 247.7
Goodwill Additions, net of adjustments | 0.0 | 0.0
Goodwill, Written off Related to Sale of Business Unit |  | 0.0
Goodwill, Translation Adjustments | 0.0 | (0.1)
Goodwill | 247.7 | 247.6
LaSalle Investment Management |  |
Goodwill [Roll Forward] |  |
Goodwill | 56.3 | 55.6
Goodwill Additions, net of adjustments | 0.0 | 0.0
Goodwill, Written off Related to Sale of Business Unit |  | 0.0
Goodwill, Translation Adjustments | 0.8 | 0.0
Goodwill | $ 57.1 | $ 55.6

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- Definition The aggregate amount of goodwill acquired in the period and allocated to the reportable segment. The value is stated at fair value based on the purchase price allocation. Also includes purchase price allocation adjustment for allocations not yet complete at the prior year end. + References No definition available. + Details
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- Definition Amount of foreign currency translation gain (loss) which increases (decreases) asset representing future economic benefit from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482573/350-20-50-1 + Details
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